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freebsd-dev/sys/arm/allwinner/aw_wdog.c
Conrad Meyer e2e050c8ef Extract eventfilter declarations to sys/_eventfilter.h 
This allows replacing "sys/eventfilter.h" includes with "sys/_eventfilter.h"
in other header files (e.g., sys/{bus,conf,cpu}.h) and reduces header
pollution substantially.

EVENTHANDLER_DECLARE and EVENTHANDLER_LIST_DECLAREs were moved out of .c
files into appropriate headers (e.g., sys/proc.h, powernv/opal.h).

As a side effect of reduced header pollution, many .c files and headers no
longer contain needed definitions.  The remainder of the patch addresses
adding appropriate includes to fix those files.

LOCK_DEBUG and LOCK_FILE_LINE_ARG are moved to sys/_lock.h, as required by
sys/mutex.h since r326106 (but silently protected by header pollution prior
to this change).

No functional change (intended).  Of course, any out of tree modules that
relied on header pollution for sys/eventhandler.h, sys/lock.h, or
sys/mutex.h inclusion need to be fixed.  __FreeBSD_version has been bumped.
2019-05-20 00:38:23 +00:00

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/*-
* Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
* Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/systm.h>
#include <sys/watchdog.h>
#include <sys/reboot.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <machine/machdep.h>
#include <arm/allwinner/aw_wdog.h>
#define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
#define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
#define A10_WDOG_CTRL 0x00
#define A31_WDOG_CTRL 0x10
#define WDOG_CTRL_RESTART (1 << 0)
#define A31_WDOG_CTRL_KEY (0xa57 << 1)
#define A10_WDOG_MODE 0x04
#define A31_WDOG_MODE 0x18
#define A10_WDOG_MODE_INTVL_SHIFT 3
#define A31_WDOG_MODE_INTVL_SHIFT 4
#define A10_WDOG_MODE_RST_EN (1 << 1)
#define WDOG_MODE_EN (1 << 0)
#define A31_WDOG_CONFIG 0x14
#define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0)
#define A31_WDOG_CONFIG_RST_EN_INT (2 << 0)
struct aw_wdog_interval {
uint64_t milliseconds;
unsigned int value;
};
struct aw_wdog_interval wd_intervals[] = {
{ 500, 0 },
{ 1000, 1 },
{ 2000, 2 },
{ 3000, 3 },
{ 4000, 4 },
{ 5000, 5 },
{ 6000, 6 },
{ 8000, 7 },
{ 10000, 8 },
{ 12000, 9 },
{ 14000, 10 },
{ 16000, 11 },
{ 0, 0 } /* sentinel */
};
static struct aw_wdog_softc *aw_wdog_sc = NULL;
struct aw_wdog_softc {
device_t dev;
struct resource * res;
struct mtx mtx;
uint8_t wdog_ctrl;
uint32_t wdog_ctrl_key;
uint8_t wdog_mode;
uint8_t wdog_mode_intvl_shift;
uint8_t wdog_mode_en;
uint8_t wdog_config;
uint8_t wdog_config_value;
};
#define A10_WATCHDOG 1
#define A31_WATCHDOG 2
static struct ofw_compat_data compat_data[] = {
{"allwinner,sun4i-a10-wdt", A10_WATCHDOG},
{"allwinner,sun6i-a31-wdt", A31_WATCHDOG},
{NULL, 0}
};
static void aw_wdog_watchdog_fn(void *, u_int, int *);
static void aw_wdog_shutdown_fn(void *, int);
static int
aw_wdog_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
case A10_WATCHDOG:
device_set_desc(dev, "Allwinner A10 Watchdog");
return (BUS_PROBE_DEFAULT);
case A31_WATCHDOG:
device_set_desc(dev, "Allwinner A31 Watchdog");
return (BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
aw_wdog_attach(device_t dev)
{
struct aw_wdog_softc *sc;
int rid;
if (aw_wdog_sc != NULL)
return (ENXIO);
sc = device_get_softc(dev);
sc->dev = dev;
rid = 0;
sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
if (sc->res == NULL) {
device_printf(dev, "could not allocate memory resource\n");
return (ENXIO);
}
aw_wdog_sc = sc;
switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
case A10_WATCHDOG:
sc->wdog_ctrl = A10_WDOG_CTRL;
sc->wdog_mode = A10_WDOG_MODE;
sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT;
sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN;
break;
case A31_WATCHDOG:
sc->wdog_ctrl = A31_WDOG_CTRL;
sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY;
sc->wdog_mode = A31_WDOG_MODE;
sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT;
sc->wdog_mode_en = WDOG_MODE_EN;
sc->wdog_config = A31_WDOG_CONFIG;
sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM;
break;
default:
bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
return (ENXIO);
}
mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF);
EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0);
EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, sc,
SHUTDOWN_PRI_LAST - 1);
return (0);
}
static void
aw_wdog_watchdog_fn(void *private, u_int cmd, int *error)
{
struct aw_wdog_softc *sc;
uint64_t ms;
int i;
sc = private;
mtx_lock(&sc->mtx);
cmd &= WD_INTERVAL;
if (cmd > 0) {
ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
i = 0;
while (wd_intervals[i].milliseconds &&
(ms > wd_intervals[i].milliseconds))
i++;
if (wd_intervals[i].milliseconds) {
WRITE(sc, sc->wdog_mode,
(wd_intervals[i].value << sc->wdog_mode_intvl_shift) |
sc->wdog_mode_en);
WRITE(sc, sc->wdog_ctrl,
WDOG_CTRL_RESTART | sc->wdog_ctrl_key);
if (sc->wdog_config)
WRITE(sc, sc->wdog_config,
sc->wdog_config_value);
*error = 0;
}
else {
/*
* Can't arm
* disable watchdog as watchdog(9) requires
*/
device_printf(sc->dev,
"Can't arm, timeout is more than 16 sec\n");
mtx_unlock(&sc->mtx);
WRITE(sc, sc->wdog_mode, 0);
return;
}
}
else
WRITE(sc, sc->wdog_mode, 0);
mtx_unlock(&sc->mtx);
}
static void
aw_wdog_shutdown_fn(void *private, int howto)
{
if ((howto & (RB_POWEROFF|RB_HALT)) == 0)
aw_wdog_watchdog_reset();
}
void
aw_wdog_watchdog_reset(void)
{
if (aw_wdog_sc == NULL) {
printf("Reset: watchdog device has not been initialized\n");
return;
}
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode,
(wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) |
aw_wdog_sc->wdog_mode_en);
if (aw_wdog_sc->wdog_config)
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config,
aw_wdog_sc->wdog_config_value);
WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl,
WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key);
while(1)
;
}
static device_method_t aw_wdog_methods[] = {
DEVMETHOD(device_probe, aw_wdog_probe),
DEVMETHOD(device_attach, aw_wdog_attach),
DEVMETHOD_END
};
static driver_t aw_wdog_driver = {
"aw_wdog",
aw_wdog_methods,
sizeof(struct aw_wdog_softc),
};
static devclass_t aw_wdog_devclass;
DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0);
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